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x in (-oo:+oo)
(-1/2)*(14-(6*x)) = 0
(-1/2)*(14-6*x) = 0
-1/2*(14-6*x) = 0
14-6*x = 0 // - 14
-6*x = -14 // : -6
x = -14/(-6)
x = 7/3
x = 7/3
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